Journal
NANO LETTERS
Volume 21, Issue 12, Pages 5028-5035Publisher
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.1c00801
Keywords
Floquet-Bloch states; dissipation; time- and angle-resolved photoemission spectroscopy; time-dependent density functional theory; driven two-level system with dissipation
Categories
Funding
- Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) [CRC 925, 170620586, CRC 1277, 314695032]
- Cluster of Excellence CUI: Advanced Imaging of Matter
- European Research Council [851280, 694097]
- European Union Graphene Flagship [785219, 881603]
- Grupos Consolidados [IT1249-19]
- JSPS KAKENHI [JP20K14382]
- European Research Council (ERC) [694097, 851280] Funding Source: European Research Council (ERC)
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Floquet theory offers exciting possibilities for electronic structure control with light, but experimental demonstration in solids is limited. The influence of scattering on Floquet-Bloch states remains poorly understood.
Floquet theory has spawned many exciting possibilities for electronic structure control with light, with enormous potential for future applications. The experimental demonstration in solids, however, remains largely unrealized. In particular, the influence of scattering on the formation of Floquet- Bloch states remains poorly understood. Here we combine time-and angle-resolved photoemission spectroscopy with time-dependent density functional theory and a two-level model with relaxation to investigate the survival of Floquet-Bloch states in the presence of scattering. We find that Floquet-Bloch states will be destroyed if scattering-activated by electronic excitations-prevents the Bloch electrons from following the driving field coherently. The two-level model also shows that Floquet-Bloch states reappear at high field intensities where energy exchange with the driving field dominates over energy dissipation to the bath. Our results clearly indicate the importance of long scattering times combined with strong driving fields for the successful realization of various Floquet phenomena.
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